/* Intelligent Transportation Concepts, LLC — site styles */

:root {
  --bg: #F6F8FA;
  --bg-2: #EDF1F5;
  --surface: #FFFFFF;
  --ink: #16212C;
  --ink-2: #3E4C5A;
  --muted: #6B7784;
  --rule: #D5DCE3;
  --rule-strong: #B9C3CE;
  --navy: #152A3F;
  --navy-ink: #FFFFFF;
  --navy-muted: #A9B8C8;
  --accent: #C68F05;
  --accent-ink: #7A5700;
  --accent-soft: #FBF3DC;
  --sig-green: #2F8F5B;
  --sig-amber: #D99A06;
  --sig-red: #B84A3A;
  --shadow: 0 1px 2px rgba(22,33,44,.06), 0 8px 24px rgba(22,33,44,.06);
  --font-display: "Newsreader", "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  --font-body: "Source Sans 3", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --measure: 66ch;
  --gutter: clamp(16px, 4vw, 40px);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0F171F;
    --bg-2: #141F2A;
    --surface: #182430;
    --ink: #E7ECF1;
    --ink-2: #C3CCD6;
    --muted: #8D9AA8;
    --rule: #2A3947;
    --rule-strong: #3A4B5C;
    --navy: #0B1520;
    --navy-ink: #EEF2F6;
    --navy-muted: #8FA2B6;
    --accent: #E4AC1E;
    --accent-ink: #F0C65A;
    --accent-soft: #2A2410;
    --sig-green: #4FB07A;
    --sig-amber: #E9AF2C;
    --sig-red: #D2695A;
    --shadow: 0 1px 2px rgba(0,0,0,.4), 0 8px 24px rgba(0,0,0,.35);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0F171F;
  --bg-2: #141F2A;
  --surface: #182430;
  --ink: #E7ECF1;
  --ink-2: #C3CCD6;
  --muted: #8D9AA8;
  --rule: #2A3947;
  --rule-strong: #3A4B5C;
  --navy: #0B1520;
  --navy-ink: #EEF2F6;
  --navy-muted: #8FA2B6;
  --accent: #E4AC1E;
  --accent-ink: #F0C65A;
  --accent-soft: #2A2410;
  --sig-green: #4FB07A;
  --sig-amber: #E9AF2C;
  --sig-red: #D2695A;
  --shadow: 0 1px 2px rgba(0,0,0,.4), 0 8px 24px rgba(0,0,0,.35);
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.55;
  font-weight: 400;
}

a { color: inherit; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }
img, svg { max-width: 100%; height: auto; }

h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 500; line-height: 1.15; margin: 0; text-wrap: balance; letter-spacing: -0.005em; }
h1 { font-size: clamp(2.1rem, 4.6vw, 3.4rem); }
h2 { font-size: clamp(1.7rem, 3vw, 2.3rem); }
h3 { font-size: 1.28rem; }
p { margin: 0; }
.lede { font-size: 1.16rem; color: var(--ink-2); line-height: 1.5; }
.eyebrow { font-family: var(--font-body); font-size: .78rem; font-weight: 600; text-transform: uppercase; letter-spacing: .12em; color: var(--accent-ink); }
.small { font-size: .92rem; color: var(--muted); }
.mono { font-family: var(--font-mono); font-size: .86rem; letter-spacing: 0; }

.wrap { max-width: 1160px; margin-inline: auto; padding-inline: var(--gutter); }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--rule);
}
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 64px; position: relative; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.brand-mark { width: 30px; height: 30px; flex: none; }
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-name { font-family: var(--font-display); font-size: 1.12rem; font-weight: 500; }
.brand-sub { font-size: .72rem; text-transform: uppercase; letter-spacing: .1em; color: var(--muted); }
.site-nav { display: flex; align-items: center; gap: 4px 22px; flex-wrap: wrap; }
.site-nav a { text-decoration: none; font-size: .95rem; color: var(--ink-2); padding: 6px 0; border-bottom: 1.5px solid transparent; }
.site-nav a:hover { color: var(--ink); border-bottom-color: var(--accent); }
.site-nav a.btn { border-bottom: 1px solid var(--navy); padding: 9px 14px; color: var(--navy-ink); }
.nav-toggle { display: none; background: none; border: 1px solid var(--rule-strong); color: var(--ink); border-radius: 6px; padding: 8px 10px; font: inherit; font-size: .9rem; cursor: pointer; }
@media (max-width: 900px) {
  .site-nav { display: none; position: absolute; left: 0; right: 0; top: 100%; background: var(--surface); border-bottom: 1px solid var(--rule); flex-direction: column; align-items: stretch; padding: 8px var(--gutter) 16px; gap: 0; box-shadow: var(--shadow); }
  .site-nav.open { display: flex; }
  .site-nav a { padding: 12px 0; border-bottom: 1px solid var(--rule); }
  .site-nav a.btn { margin-top: 12px; align-self: flex-start; padding: 10px 16px; }
  .nav-toggle { display: inline-block; }
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 18px; border-radius: 6px; text-decoration: none;
  font-weight: 600; font-size: .96rem; line-height: 1; border: 1px solid transparent;
  transition: background .15s, color .15s, border-color .15s;
}
.btn-primary { background: var(--navy); color: var(--navy-ink); border-color: var(--navy); }
.btn-primary:hover { background: color-mix(in srgb, var(--navy) 80%, var(--accent)); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--rule-strong); }
.btn-ghost:hover { border-color: var(--ink); }
.btn svg { width: 16px; height: 16px; }

/* ---------- hero ---------- */
.hero { padding-block: clamp(48px, 7vw, 96px) clamp(40px, 5vw, 64px); border-bottom: 1px solid var(--rule); }
.hero .wrap { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: clamp(32px, 5vw, 72px); align-items: center; }
.hero-copy { display: flex; flex-direction: column; gap: 22px; }
.hero h1 { max-width: 18ch; }
.hero .lede { max-width: 56ch; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 6px; }
.hero-who { display: flex; flex-direction: column; gap: 2px; padding-top: 14px; border-top: 1px solid var(--rule); }
.hero-who strong { font-family: var(--font-display); font-weight: 500; font-size: 1.2rem; }
.hero-who span { color: var(--ink-2); font-size: .95rem; }
@media (max-width: 900px) { .hero .wrap { grid-template-columns: 1fr; } .hero-graphic { max-width: 560px; } }

/* signal event-log figure */
.eventlog { margin: 0; background: var(--navy); color: var(--navy-ink); border-radius: 10px; padding: 22px 22px 18px; box-shadow: var(--shadow); font-family: var(--font-mono); }
.eventlog-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; font-size: .72rem; letter-spacing: .06em; text-transform: uppercase; color: var(--navy-muted); margin-bottom: 14px; }
.eventlog svg { display: block; width: 100%; height: auto; }
.eventlog-foot { display: flex; flex-wrap: wrap; gap: 6px 18px; margin-top: 14px; font-size: .74rem; color: var(--navy-muted); }
.eventlog-foot span::before { content: ""; display: inline-block; width: 9px; height: 9px; border-radius: 2px; margin-right: 6px; vertical-align: -1px; }
.eventlog-foot .k-g::before { background: var(--sig-green); }
.eventlog-foot .k-y::before { background: var(--sig-amber); }
.eventlog-foot .k-r::before { background: var(--sig-red); }
.eventlog figcaption { margin-top: 12px; font-family: var(--font-body); font-size: .84rem; color: var(--navy-muted); line-height: 1.4; }

/* fact strip */
.facts { border-bottom: 1px solid var(--rule); background: var(--bg-2); }
.facts .wrap { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0 24px; }
.fact { padding: 18px 0; display: flex; flex-direction: column; gap: 3px; border-right: 1px solid var(--rule); padding-right: 24px; }
.fact:last-child { border-right: 0; padding-right: 0; }
.fact b { font-family: var(--font-display); font-weight: 500; font-size: 1.3rem; line-height: 1.15; }
.fact span { font-size: .84rem; color: var(--muted); line-height: 1.3; }
@media (max-width: 900px) {
  .facts .wrap { grid-template-columns: repeat(2, 1fr); }
  .fact { border-right: 0; padding-right: 0; border-bottom: 1px solid var(--rule); }
  .fact:nth-child(odd) { border-right: 1px solid var(--rule); padding-right: 24px; }
  .fact:last-child { border-bottom: 0; }
}

/* ---------- sections ---------- */
.section { padding-block: clamp(48px, 7vw, 88px); }
.section + .section { border-top: 1px solid var(--rule); }
.section-head { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr); gap: 20px 56px; align-items: start; margin-bottom: clamp(28px, 4vw, 44px); }
.section-head .eyebrow { margin-bottom: 8px; display: block; }
.section-head .lede { max-width: 60ch; }
@media (max-width: 800px) { .section-head { grid-template-columns: 1fr; gap: 12px; } }
.section-alt { background: var(--bg-2); }

/* expertise grid */
.areas { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0; border-top: 1px solid var(--rule); }
.area { padding: 22px 0; border-bottom: 1px solid var(--rule); display: flex; flex-direction: column; gap: 8px; }
.area:nth-child(odd) { border-right: 1px solid var(--rule); padding-right: 32px; }
.area:nth-child(even) { padding-left: 32px; }
.area h3 { font-size: 1.22rem; }
.area p { color: var(--ink-2); font-size: .98rem; max-width: 52ch; }
.area .tools { font-family: var(--font-mono); font-size: .76rem; color: var(--muted); }
@media (max-width: 720px) {
  .areas { grid-template-columns: 1fr; }
  .area, .area:nth-child(odd), .area:nth-child(even) { padding: 20px 0; border-right: 0; }
}

/* testimony table */
.table-wrap { overflow-x: auto; border: 1px solid var(--rule); border-radius: 8px; background: var(--surface); }
table { width: 100%; border-collapse: collapse; font-size: .93rem; min-width: 720px; }
thead th { text-align: left; font-family: var(--font-mono); font-size: .72rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); font-weight: 500; padding: 12px 16px; border-bottom: 1px solid var(--rule-strong); background: var(--bg-2); }
tbody td { padding: 14px 16px; border-bottom: 1px solid var(--rule); vertical-align: top; }
tbody tr:last-child td { border-bottom: 0; }
td.year { font-family: var(--font-mono); font-size: .84rem; white-space: nowrap; font-variant-numeric: tabular-nums; }
.pill { display: inline-block; padding: 2px 9px; border-radius: 999px; font-size: .78rem; font-weight: 600; border: 1px solid var(--rule-strong); color: var(--ink-2); white-space: nowrap; }
.table-note { margin-top: 12px; }

/* engagements list */
.sub-head { font-family: var(--font-body); font-weight: 600; font-size: .8rem; text-transform: uppercase; letter-spacing: .12em; color: var(--muted); margin: 48px 0 6px; }
.engagements { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px 40px; }
.engagement { display: grid; grid-template-columns: 82px 1fr; gap: 14px; padding-top: 16px; border-top: 1px solid var(--rule); }
.engagement .when { font-family: var(--font-mono); font-size: .8rem; color: var(--muted); padding-top: 4px; font-variant-numeric: tabular-nums; }
.engagement h3 { font-size: 1.1rem; font-family: var(--font-body); font-weight: 600; margin-bottom: 2px; }
.engagement .venue { display: block; font-size: .85rem; color: var(--muted); margin-bottom: 6px; }
.engagement p { color: var(--ink-2); font-size: .95rem; }
@media (max-width: 760px) { .engagements { grid-template-columns: 1fr; } }

ul.clients { list-style: none; padding: 0; margin: 10px 0 0; display: flex; flex-wrap: wrap; gap: 8px 24px; }
ul.clients li { font-size: .95rem; color: var(--ink-2); }
ul.clients li span { color: var(--muted); font-family: var(--font-mono); font-size: .78rem; margin-left: 6px; }

/* credentials */
.cred-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 40px; }
.cred-col { display: flex; flex-direction: column; gap: 18px; }
.cred-col h3 { font-family: var(--font-body); font-weight: 600; font-size: .8rem; text-transform: uppercase; letter-spacing: .12em; color: var(--muted); padding-bottom: 10px; border-bottom: 1px solid var(--rule-strong); }
.cred { display: flex; flex-direction: column; gap: 2px; }
.cred b { font-weight: 600; font-size: 1rem; }
.cred span { color: var(--ink-2); font-size: .93rem; }
.cred .mono { color: var(--muted); font-size: .78rem; }
@media (max-width: 860px) { .cred-grid { grid-template-columns: 1fr; gap: 32px; } }

/* methodology */
.daubert { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 28px 32px; }
.dau { display: flex; flex-direction: column; gap: 8px; padding-top: 14px; border-top: 2px solid var(--accent); }
.dau h3 { font-size: 1.18rem; }
.dau p { color: var(--ink-2); font-size: .96rem; }
@media (max-width: 860px) { .daubert { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .daubert { grid-template-columns: 1fr; } }
.standards { margin-top: 36px; display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.standards .lbl { font-size: .78rem; text-transform: uppercase; letter-spacing: .1em; color: var(--muted); margin-right: 6px; font-weight: 600; }
.standards span:not(.lbl) { font-family: var(--font-mono); font-size: .8rem; padding: 4px 10px; border: 1px solid var(--rule-strong); border-radius: 4px; background: var(--surface); }

/* publications & research */
.pubs { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 40px 56px; }
.pub-group h3 { font-family: var(--font-body); font-weight: 600; font-size: .8rem; text-transform: uppercase; letter-spacing: .12em; color: var(--muted); padding-bottom: 10px; border-bottom: 1px solid var(--rule-strong); margin-bottom: 14px; }
.pub-group ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 12px; }
.pub-group li { font-size: .93rem; color: var(--ink-2); }
.pub-group li .cite { color: var(--muted); }
.research-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.research-list li { display: grid; grid-template-columns: 96px 1fr; gap: 14px; font-size: .93rem; color: var(--ink-2); }
.research-list li span:first-child { font-family: var(--font-mono); font-size: .78rem; color: var(--muted); padding-top: 3px; font-variant-numeric: tabular-nums; }
.pub-more { margin-top: 18px; }
@media (max-width: 800px) { .pubs { grid-template-columns: 1fr; } }

/* engagement process */
.process { counter-reset: step; list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 24px; }
.process li { counter-increment: step; display: flex; flex-direction: column; gap: 8px; padding-top: 14px; border-top: 1px solid var(--rule-strong); }
.process li::before { content: counter(step, decimal-leading-zero); font-family: var(--font-mono); font-size: .8rem; color: var(--accent-ink); letter-spacing: .06em; }
.process h3 { font-size: 1.08rem; font-family: var(--font-body); font-weight: 600; }
.process p { font-size: .92rem; color: var(--ink-2); }
@media (max-width: 960px) { .process { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .process { grid-template-columns: 1fr; } }
.terms { margin-top: 44px; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px 40px; }
.terms div { display: flex; gap: 12px; font-size: .95rem; color: var(--ink-2); align-items: flex-start; }
.terms svg { flex: none; width: 18px; height: 18px; margin-top: 3px; color: var(--accent); }
@media (max-width: 720px) { .terms { grid-template-columns: 1fr; } }

/* contact */
.contact { background: var(--navy); color: var(--navy-ink); }
.contact .wrap { display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr); gap: 40px 64px; align-items: start; }
.contact .eyebrow { color: var(--accent); }
.contact .lede { color: var(--navy-muted); }
.contact-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 14px; }
.contact-list li { display: grid; grid-template-columns: 92px 1fr; gap: 12px; padding-bottom: 14px; border-bottom: 1px solid color-mix(in srgb, var(--navy-ink) 14%, transparent); }
.contact-list li span:first-child { font-size: .78rem; text-transform: uppercase; letter-spacing: .1em; color: var(--navy-muted); padding-top: 4px; }
.contact-list li span:last-child { font-size: 1.05rem; }
.contact-list a { text-decoration: none; font-size: 1.08rem; color: var(--navy-ink); border-bottom: 1px solid color-mix(in srgb, var(--navy-ink) 35%, transparent); }
.contact-list a:hover { border-bottom-color: var(--accent); }
.contact .btn-primary { background: var(--accent); border-color: var(--accent); color: #1A1400; }
.contact .btn-primary:hover { background: #F0C65A; border-color: #F0C65A; color: #1A1400; }
.contact .btn-ghost { color: var(--navy-ink); border-color: color-mix(in srgb, var(--navy-ink) 35%, transparent); }
.contact .btn-ghost:hover { border-color: var(--navy-ink); }
.contact-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 22px; }
.contact .small { color: var(--navy-muted); margin-top: 14px; max-width: 52ch; }
@media (max-width: 800px) { .contact .wrap { grid-template-columns: 1fr; } }

/* footer */
.site-footer { padding-block: 28px 36px; font-size: .84rem; color: var(--muted); border-top: 1px solid var(--rule); }
.site-footer .wrap { display: flex; flex-direction: column; gap: 10px; }
.site-footer p { max-width: 90ch; }